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WordPress 3.5.1 Denial Of Service

WordPress 3.5.1 Denial Of Service
Posted Jun 13, 2013
Authored by Krzysztof Katowicz-Kowalewski

WordPress version 3.5.1 suffers from a denial of service vulnerability.

tags | advisory, denial of service
advisories | CVE-2013-2173
MD5 | 0b04261af680ba7d1debaf0108b1147c

WordPress 3.5.1 Denial Of Service

Change Mirror Download
Version 3.5.1 (latest) of popular blogging engine WordPress suffers from remote denial of service vulnerability. The bug exists in encryption module (class-phpass.php). The exploitation of this vulnerability is possible only when at least one post is protected by a password.

Time frames:
31.05.2013 WordPress security team has been informed about the vulnerability (no response).
07.06.2013 The vulnerability has been released to the public.

More information (including proof of concept):
https://vndh.net/note:wordpress-351-denial-service

A way out (before official WordPress update) to secure existing installations is to apply the following patch:

--- wp-includes/class-phpass.php
+++ wp-includes/class-phpass.php
@@ -120,7 +120,7 @@
return $output;

$count_log2 = strpos($this->itoa64, $setting[3]);
- if ($count_log2 < 7 || $count_log2 > 30)
+ if ($count_log2 < 7 || $count_log2 > 13)
return $output;

$count = 1 << $count_log2;

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